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During winter months, cold and ice may result in inaccurate real-time gage height and streamflow data. Adjustments or deletions of this data can only be done after detailed analysis.
Elevation at top of Bascule gates is 55.00 ft.
LOCATION.-Lat 41°01'06", long 74°00'04" referenced to North American Datum of 1983, Old Tappan Borough, Bergen County, NJ, Hydrologic Unit 02030103, at dam on Hackensack River, 0.5 mi north of Old Tappan, and 3.0 mi upstream from gaging station on Hackensack River at Rivervale, NJ (01377000).
DRAINAGE AREA.-49.0 mi2
PERIOD OF RECORD.-October 1966 to current year. Prior to October 2010, month-end elevation and contents were provided by United Water New Jersey.
GAGE.-Water-stage recorder and staff gage. Datum of gage is National Geodetic Vertical Datum of 1929.
COOPERATION.-Funding for this gage is provided by United Water New Jersey.